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32bf54e1 - Improve selection and merged cell announcements in LibreOffice Calc 7.3 and above (#12849)

Improve selection and merged cell announcements in LibreOffice Calc 7.3 and above (#12849) Link to issue number: Fixes #9310 Fixes #6897 Summary of the issue: In LibreOffice calc, selection is not announced and for merged cells, only the first cell is announced. Description of how this pull request fixes the issue: In LibreOffice 7.3 development branch, support for IAccessibleTable2 and IAccessibleTableCell were added. This allows us to implement something that works as expected.